c#循环中计时等待功能实现

代码如下：  

  private void button1_Click(object sender, EventArgs e)

        {
           for (Int32 i=0;i<999999999;i++)
            {
                textBox1.Text = i.ToString();
                if (i == 10) break;
                this.Update();
                System.Threading.Thread.Sleep(1000 * 2 );//等2秒鍾再繼續
            }
        }